linux-kernel - Re: [PATCH] LIS3LV02Dx Accelerometer driver

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Date:	Sun, 26 Oct 2008 23:39:01 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Pavel Machek <pavel@...e.cz>
Cc:	kernel list <linux-kernel@...r.kernel.org>,
	Eric Piel <eric.piel@...mplin-utc.net>,
	Yan Burman <burman.yan@...il.com>,
	Pau Oliva Fora <pau@...ack.org>
Subject: Re: [PATCH] LIS3LV02Dx Accelerometer driver

On Wed, 22 Oct 2008 17:44:59 +0200 Pavel Machek <pavel@...e.cz> wrote:

> 
> LIS3LV02Dx Accelerometer driver
> 
> This adds a driver to the accelerometer sensor found in several HP
> laptops (under the commercial names of "HP Mobile Data Protection
> System 3D" and "HP 3D driveguard"). It tries to have more or less the
> same interfaces as the hdaps and other accelerometer drivers: in sysfs
> and as a joystick.
> 
> This driver was first written by Yan Burman. Eric Piel has updated it
> and slimed it up (including the removal of an interface to access to
> the free-fall feature of the sensor because it is not reliable enough
> for now). Pavel Machek removed few more features and switched locking
> from semaphore to mutex.
> 
> Several people have contributed to the database of the axes.
> 
> ...
>
> +/* joystick device poll interval in milliseconds */
> +#define MDPS_POLL_INTERVAL 50
>
> ...
>
> +static int lis3lv02d_joystick_kthread(void *data)
> +{
> +	int x, y, z;
> +
> +	while (!kthread_should_stop()) {
> +		lis3lv02d_get_xyz(adev.device->handle, &x, &y, &z);
> +		input_report_abs(adev.idev, ABS_X, x - adev.xcalib);
> +		input_report_abs(adev.idev, ABS_Y, y - adev.ycalib);
> +		input_report_abs(adev.idev, ABS_Z, z - adev.zcalib);
> +
> +		input_sync(adev.idev);
> +
> +		try_to_freeze();
> +		msleep_interruptible(MDPS_POLL_INTERVAL);

You'll have the powertop police on your tail.

Is there no alternative?

> +	}
> +
> +	return 0;
> +}

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